Engine



FIG. 1 is a top, front perspective view of an engine showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front and left side perspective view thereof;

FIG. 4 is a rear and right side perspective view thereof;

FIG. 5 is a rear and left side perspective view thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for an engine, as shown. 